646750075 has 6 divisors (see below), whose sum is σ = 801970124. Its totient is φ = 517400040.

The previous prime is 646750073. The next prime is 646750103. The reversal of 646750075 is 570057646.

It is a happy number.

It is not a de Polignac number, because 646750075 - 2¹ = 646750073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646750073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12934977 + ... + 12935026.

Almost surely, 2^646750075 is an apocalyptic number.

646750075 is a deficient number, since it is larger than the sum of its proper divisors (155220049).

646750075 is a wasteful number, since it uses less digits than its factorization.

646750075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25870013 (or 25870008 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 40.

The square root of 646750075 is about 25431.2814266210. The cubic root of 646750075 is about 864.7929940010.

The spelling of 646750075 in words is "six hundred forty-six million, seven hundred fifty thousand, seventy-five".